Screening and comminuting device



w. H. LANNERT SCREENING AND COMMINUTING DEVICE Aug. 18, 1959 Filed'Feb. 2, 195e 4 Sheets-Sheet 1 'l' W s Aug. 18, 1959 l w. H. LANNE'T 2,900,082

` SCREENING AND' COMMINUTING DEVICE l Filed Feb. 2. 195e 4 sheets-sheet'z Aug 18, 1959 w. H. LANNERT 2,900,082

SCREENING AND COMMINUTING DEVICE 4 SheQts-Sheet 5 Filed Feb. 2, 1956 Aug. 18, 1959 w. H. LANNERT 2,900,082

l SCREENING AND COMMINUTING DEVICE Filed Feb. 2, 1956 4 Sheets-Sheet 4 wwwa/325 Elli United SWCS Patent itntosiY l SCREENING AND CoMMlNUTlNG DEvIcEv William H. Lannert, Skokie, Ill., assignor to Chicago Pump Company, a corporation of Delaware Application 'February'2, 1956, Serial No. 563,023

11 Claims. (Cl. 210-173) This invention relates to ya screening and comminuting device-for intercepting solids owin-g in a sewage stream and comminuting the solids to permit them -to flow through the screen along with the liquid sewage.

In accordance lwith the present invention a screen 1s disposed in vertical position in the channel through which the sewage flows. The screen preferably comprises a plurality of V-shaped bars suitably secured in a frame. The bars may be of any suitable shape, or tautly held flexible ribbons may be used instead of bars. The screen elements are arranged vertically. A horizontally disposed cutting cylinder and a cooperating comb are mount* ed in a supporting frame adapted to be moved vertically relative to the screen, and a motor for rotating the cutting cylinder is mounted on the top of the supporting frame. Although a submersible type of motor is used, it is positioned above the screen to avoid interference with the ilow capacity o-f the screen. In this position it is above the normal maximum level of the sewage.

The cutting cylinder is constantly rotated in one direction, and is reciprocated vertically along with the supporting frame in juxtaposition to the upstream face of the screen by means of a link and an endless chain driven by a second motor. The supporting frame is pivoted at its top to permit the cutting cylinder to swing out from the screen whenever it engages a solid too large to be comminuted in a single pass. The direction of rotation of the cutting cylinder is away from `the screen in the down-travel so that any large objects at the bottom of the screen will be forced away from the screen by the motion of the cutting disks as the cutting cylinder is moved downwardly.

The cutting cylinder comprises a' series of cutting disks held in spaced relationship on a shaft by means of clamps and spacers. A set of shear bars is provided in each space between adjacent cutting disks.

The structure by which the above mentioned and other advantages of the invention are attained will be described in the following specification, taken in conjunction with the accompanying drawings, showing a preferred illustrative embodiment of the invention, in which:

Figure l is a perspective view of a screening and comminuting device embodying the invention, showing it installed in a sewage channel;

Fig. 2 is a front elevational yview of the screening device shown in Fig. l;

Fig. 3 is a side elevation of the device lwith the supporting frame in its normal position juxtaposed against the` screen;

Fig. 4 is `a view similar to Fig. 3, with the supporting frame pivoted outwardly to space the cutting cylinder away from the screen;

Fig. 5 is a top plan view of the screening and comminuting device;

Fig. 6 is a cross sectional view, taken along the line 6-6 of Fig. 2;

Fig. 7 is a cross sectional view, taken along the line 7-1-7 of Fig. 2;

ice

2 YFig.l 8 is a cross sectional view, similar to Fig. 7, but with the cutting cylinder swung away from the screen;

Fig'.,9 is a fragmentary vertical sectionalvview withv the cutting` cylinder juxtaposed against thescreen;

Fig. 10 is a View, similar to Fig. 9, with the cutting cylinder swung away from the screen; and

Fig. 1l is a vertical sectional View, taken along the line 11-11 of Fig. 2.

Referring to the drawings, the reference numerals 2 and 3 indicate concrete walls forming an iniiuent channel 4 and. an eiuent channel 5. A rectangular metal frame 6 comprising side walls 7l and 8 and a top wall 9 is mounted to extend across the channel between side walls 2 and 3. A pair of angle irons 10 secured to side walls 2 and 3 on the downstream side of frame 6 supports the frame in its vertical position.

A screen 11 is positioned Ivertically within the lower portionof the upstream side of frame 6. The screen has a transverse top member 12, bottom member 13, and side members 14 and 15 which cooperateV to form a rigid support for a plurality of screen elements 16.v In the drawings the screen elements are in the form of V-shaped bars arranged vertically and spaced uniformly across the width yof the screen. However the screen elements may be bars of any suitable shape, or may be lat metal ribbons disposed edgewise and held under tension. The screen is preferably provided with a plurality of transverse reinforcing bars 17. Verticalreinforcing strips 18 are preferably secured to side walls 7 and 8 adjacent the rear surface of screen 11. l

YA center guide in the form of a T-bar 19 is secured to top member 12 and extends upwardly therefrom. Tf bar 19 has its upper endsecured to a flange 2@ extending from a plate 21 which is welded to the upper portion of frame 6. An angle bar 22 secured at its lower end to top member 12 projects upwardly and supports a sprocket 23 rotatably mounted on its upper end. A similar ysprocket 24 is rotatably mounted on plate 2l adjacent its lower edge and an endless chain 25 extends around both sprockets. The portion of plate 21 adjacent sprocket 24 is offset to permit both sprockets to be in the same plane. Sprocket 24 is driven by a motor 26 through reduction gearing 27. Motor 26 is mounted on plate 21. The top wall 9 of frame 6 is provided with a cut out 2S to provide clearance for the top of motor 26. If desired, an endless band and any suitable rotatable pulleys may be substituted for the chain 25 and sprockets 23 and 24.V

A vertical flange 29 securedto the forward edge of side wall 7 extends forwardly from the outer edge of frame 6. A similar ange 30, secured to the forward edge of side wall 8y extends forwardly from the other outer edge of frame 6. A spacer bar 31 is secured in the corner between flange 29 and the forward outer edge of side wall 7. A similar spacer bar 32 is secured inthe corner Ibetween flange 30 and side wall 8. Spacer bars 31 and 32 are each approximately the same height as flanges 29 and 30. Y v

The comminuting device comprises a cutting cfylinder of the cutting cylinder and the lower edge of the comby and thus impair the efficiency of the comminuting operation.

The comminuting device isv carried by a movable frame- 40 which is juxtaposed against frame 6 and is slidable vertically relative thereto, as hereinafter described. Frame 40 comprises a transverse top member 41, a side member 42, and a chain housing 43 which serves as the other side member of the frame. The lower end of side member 42 is secured to an end plate 44. Cylinder 33 is provided with a shaft 45 one end of which is rotatably mounted in end plate 44. The other end of shaft 45 is Irotatably mounted in housing 43. A sprocket 46 mounted on the end of shaft 45 is contained within the housing. A sprocket 47, mounted in the upper portion of chain housing 43 is driven by a motor 48 mounted on the upper portion of housing 43. An endless chain49 extends around sprockets 46 and 47 to rotate the cutting cylinder. The cutting cylinder is always rotated in the same direction.

Top member 41 of frame 40 has a pair of ears 50 projecting upwardly therefrom. A bracket 51 having a vertical portion fitting T-bar 19 has its lower portion pivotally mounted on a bolt 52 extending transversely through ears 50. The interengagement of bracket 51 and T-bar 19 permits the bracket, and frame 40 to which it is secured, to move vertically relative to frame 6, and the pivotal structure of the bracket permits frame 40 to move pivotally relative to frame 6. Spacer bars 31 and 32 prevent frame 40 from moving inwardly too close to screen 11. Side member 42 has a recessed block 53 adapted to engage spacer bar 31, and housing 43 has a similar block 54 adapted to engage spacer bar 32. The weight of the comminuting device normally holds blocks 53 and 54 in engagement with bars 31 and 32 respectively. In this position the cutting cylinder is spaced from the screen a predetermined distance that permits teeth 36 to enter'into the spaces within screen bars 16 to remove solid matter accumulated therein, but prevents the teeth from moving inwardly far enough to be damaged by contact with the metal of the screen bars.

A crank 55 has one end pivotally secured to a bracket 56 mounted on top member 41 of frame 40. The other end of the crank is pivotally secured to a stud 57 projecting laterally from chain 25. Stud`57 is rigidly secured to chain 25 so that continuous movement of the chain around sprockets 23 and 24 reciprocates frame 40 vertically relative to frame 6. Motor 48 s mounted on housing 43 so that it travels vertically with frame 40. This arrangement permits a fixed relationship between motor 48 and the cutting cylinder driven by it, and thus permits better control of the cutting cylinder. Although motor 48 is submersible and will operate under water, it is preferred to mount it above transverse member 41 so that when frame 40 is in its -lowermost position the motor is above the top of the screen and is therefore out of the sewage stream.

The vertical flanges 29 and 30 serve as lateral guides during the vertical movement of frame 40 relative to frame 6. However, the extra weight on the side of frame 40 on which motor 48 is mounted might cause the frame to bind, and thus interfere with its vertical movement. The center guide 19 is provided to counteract the tendency of frame 40 to bind, and the sliding engagement of bracket 51 with the T-shaped guide 19 prevents any binding. i

Asmotor 26 drives chain 25 to reciprocate frame 40 vertically relative to frame 6, motor 48 drives chain 49 to rotate cutting cylinder 33. The direction of rotation of the cylinder moves the teeth on the lower portion of the cylinder outwardly from the screen so that if any large solids are encountered by the teeth during the downward movement of frame 40 they will be pushed away'from the screen to eliminate any possibility of the solids getting trapped between the comb support and the cutting cylinder. When solids engaged by the teeth as frame 40 is being moved upwardly are too large to be properly comminuted in one pass, the cutting cylinder may swing outwardly to pass by the. obstructing solid.

while permitting the lower portion of frame 40, in which cylinder 33 is mounted, to swing outwardly of frame 6.

While I have described a preferred embodiment of my invention in considerable detail, it will be understood that the description thereof is intended to be illustrative, rather than restrictive, as many details may be modified or changed Without departing from the spirit or scope of the invention. Accordingly, I do not desire to be restricted to the exact construction described.

I claim: Y

1. A screening and comminuting device comprising a frame including a guide bar, a screen mounted in said frame, a second frame movably mounted adjacent said iirst mentioned frame, a bracket slidably secured to said guide bar and pivotally secured to the top of said. second frame, whereby the lower portion of said second frame may swing outwardly from'said screen While the top thereof is held adjacent to said first mentioned frame.

2. A screening and comminuting device comprising a frame, a screen mounted in said frame, a vertical guide bar secured to said frame, a second frame movably mounted adjacent said first mentioned frame, a bracket slidably secured to said guide bar and pivotally secured to the top of said second frame, whereby the lower portion of said second frame may swing outwardly from said screen while the top thereof is held adjacent to said first mentioned frame.

3. A screening and comminuting device comprising a vertically disposed frame, a screen mounted in said frame, a guide bar rigidly secured to said frame, a second frame juxtaposed against said iirst mentioned frame, a cutting cylinder rotatably mounted in the lower portion of said second frame, a bracket slidably secured to said guide bar and pivotally secured to the top of said second frame, whereby said cutting cylinder may be pivotally moved outwardly from said screen as said second frame is moved upwardly with its top held against said Iirst mentioned frame by said pivoted bracket.

4. A screening and comminuting device comprising a frame, a screen mounted in said frame, a guide bar rigidly secured to said frame, a second frame movably mounted adjacent said irst mentioned frame, a bracket slidably secured to said guide lbar and pivotally secured to said second frame, a cutting cylinder mounted in the lower portion of said second frame, means for rotating said cutting cylinder to comminute solidsv removed from said screen yby said cylinder, and means for moving said second frame vertically relative to said first mentioned frame, said bracket permitting the lower portion of said second frame to swing outwardly from the first frame to move said cylinder away from said screen.

5. A screening and comminuting device comprising a vertically disposed frame, a screen mounted in said frame, said screen comprising a plurality of vertical screen elements spaced transversely of said frame, a vertical guide bar secured :to said frame, a second frame juxtaposed against said iirst mentioned frame, a bracket secured to said second mentioned frame, said bracket having a pivoted portion slidably engaging said 'guide bar, a cutting cylinder rotatably mounted in said second frame, a comb mounted adjacent said cutting cylinder, means for rotating said cylinder in proximity to said screen to remove solids therefrom and to comminute them in cooperation ,"with said comb, and means for moving said second frame of said screen, said bracket permitting said cutting cylin-y der to swing outwardly from said screen. 6. A screening and comminuting device comprising a frame, a screen mounted in said frame, said screenl comprising a plurality of screen elements spaced trans-v versely of said frame, a lguidebar secured to said frame, a second frame juxtaposed against said rst mentioned frame, a pivoted bracket secured Ato said second frame and slidably secured to said guide bar, a cutting cylinder rotatably mounted in said second frame, a comb mounted adjacent said cutting cylinder, means for rotating said cylinder in proximity to said screen to remove solids therefrom and to comminute them in cooperation with said comb, said pivoted bracket Ipermitting said cut- :ting cylinder to swing away from said screen when solids of excessive size are encountered.

7. A screening and comminuting device comprising a vertically disposed frame, a screen mounted in said frame, said screen comprising a plurality of vertical screen elements spaced transversely of said frame, a guide bar secured to said frame, a second frame juxtaposed against said rst mentioned frame, a pivoted bracket secured to the top of said second frame and slidably secured to said guide bar, a cutting cylinder rotatably mounted in said second frame, a comb mounted adjacent said cutting cylinder, means for rotating said cylinder in proximity to said screen to remove solids therefrom and to comminute them in cooperation with said comb, a pair of sprockets rotatably mounted in lixed vertical relationship relative -to said first mentioned frame, a motor mounted on said irst mentioned frame for drivling one of said sprockets, an endless chain extending around said sprockets and meshed therewith, and a crank secured at one end to said second frame and at its opposite end to said chain, whereby continuous movement of said chain reciprocates said second frame vertically relative to said rst mentioned frame to cause said cutting cylinder to periodically sweep the adjacent surface of said screen.

8. A screening and commuting device comprising a vertically disposed frame, a screen mounted -in said frame, a second frame juxtaposed against saidv irst mentioned frame, a cutting cylinder rotatably mounted in said second frame, a comb mounted adjacent said cutting cylinder, means for rotating said cylinder in proximity to said screen to remove solids therefrom and to comminute them tin cooperation with said comb, a :guide bar extending rvertically relative to said first mentioned frame, a pivoted bracket secured to the upper edge of said second frame, said bracket being slidably engaged with said guide bar to prevent separation of said second frame from said guide bar while permitting sliding and pivotal movement of said second frame relative to said first mentioned frame.

9. A screening and comminuting device comprising a stationary screen, a guide member projecting upwardly from said screen, `a frame having a transverse top member, means secured to said transverse top member for pivotally and slidably securing said frame to said guide member, means for reciprocating said frame vertically relative to said screen, a cutting cylinder rotatably mounted in said frame, a comb mounted in said frame in predetermined relationship to said cylinder, and means for rotating said cylinder to remove sol-ids from said screen and -to comminute them in cooperation with said comb.

10. A screening and comrninuting device comprising a stationary screen for intercepting sewage solids, a guide member projecting upwardly from said screen, a frame having a transverse top member, means pivotally and slidably securing said frame to said guide member, an endless chain extending in a vertical direction adjacent said frame, a crank connecting said endless chainto the top of said `frame and means to `drive said chain for reciprocating said frame vertically relative to said screen, a comb mounted in said frame, a cylinder rotatably mounted in said frame in predetermined spaced relationship to said comb, and means for rotating said cylinder to com-minute said intercepted solids as said cylinder is rotated.

11. A screening and comminuting device comprising a stationary frame, a `guide bar secured to said frame, a screen mounted in said frame, a pair of sprockets rotatably mounted in xed vertical relationship relative to said frame, a motor mounted on said frame yfor driving one of said sprockets, an endless chain extending around said `sprockets and meshed therewith, a movable frame juxtaposed against said stationary frame, a pivoted bracket secu-ring said movable frame slidably and pivotally to said guide bar, a comb mounted on said movable frame, a cutting cylinder rotatably mounted on said movable frame in predetermined spaced relationship to said comb, means lfor rotating said cylinder to remove solids from said screen and to `cornrninute them in cooperation with said comb, Iand a crank secured at one end to said movable frame and at its opposite end to said chain, whereby continuous movement of said chain reciprocates said movable frame 'vertically relative to said stationary frame to cause said cutting cylinder to periodically sweep the adjacent surface of said screen.

References Cited in the le of this patent UNITED STATES PATENTS 2,199,788 Durdin May 7, 1940 2,446,772 Laughlin Aug. 10, 1948 2,672,985 Nordel Mar. 23, 1954 

